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在linux下的网络管理大概可以通过两种方式进行实现：命令和配置文件，大部分命令执行以后只能单次生效，而配置文件可以永久生效，根据场景的不同选择不同的方式进行管理。
ifconfig：
ifconfig [-a] interfer 查看当前系统处于活动状态接口
-a：显示所有接口，包括非活动状态。
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| [iyunv@bogon yum.repos.d]# ifconfig
eno16777736: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 192.168.67.128 netmask 255.255.255.0 broadcast 192.168.67.255
inet6 fe80::20c:29ff:fe74:803f prefixlen 64 scopeid 0x20<link>
ether 00:0c:29:74:80:3f txqueuelen 1000 (Ethernet)
RX packets 7404 bytes 6161993 (5.8 MiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 1556 bytes 130066 (127.0 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
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eno16777736：网卡名称
flags：标志位
UP：网卡启用状态
BROADCAST：支持广播
RUNNING：正在运行中
MULTICAST:支持组播
mtu：最大传输单源，默认为1500
init： Ipv4地址
init6: Ipv6地址
txqueuelen：传输队列长度
RX packets：接受到报文数量
RX errors:接受时的错误的报文数量
dropped：丢包的报文数量
overruns：溢出的报文数量
frame：帧
修改网络配置：
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| [iyunv@bogon ~]# ifconfig eno33554984 192.168.77.111/24 up
[iyunv@bogon ~]# ifconfig eno33554984
eno33554984: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet6 fe80::20c:29ff:fe74:8049 prefixlen 64 scopeid 0x20<link>
ether 00:0c:29:74:80:49 txqueuelen 1000 (Ethernet)
RX packets 0 bytes 0 (0.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 102 bytes 17988 (17.5 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
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选项：
[-]promisc启动/关闭混杂模式
[-]allmulti 启动/关闭组播
up
down
route：
route 查看路由
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| [iyunv@bogon ~]# route
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
default bogon 0.0.0.0 UG 100 0 0 eno16777736
192.168.67.0 0.0.0.0 255.255.255.0 U 100 0 0 eno16777736
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route -n
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| [iyunv@bogon ~]# route -n
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
0.0.0.0 192.168.67.2 0.0.0.0 UG 100 0 0 eno16777736
192.168.67.0 0.0.0.0 255.255.255.0 U 100 0 0 eno16777736
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route add [-net|-host] target [gw GW] [dev] -net:主机路由host,目标地址为单个IP -host:网络路径net,目标地址为IP网络 1
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| [iyunv@bogon ~]# route
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
default bogon 0.0.0.0 UG 100 0 0 eno16777736
192.168.67.0 0.0.0.0 255.255.255.0 U 100 0 0 eno16777736
[iyunv@bogon ~]# route add -net 12.0.0.0/8 gw 192.168.67.2 dev eno16777736
[iyunv@bogon ~]# route
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
default bogon 0.0.0.0 UG 100 0 0 eno16777736
12.0.0.0 bogon 255.0.0.0 UG 0 0 0 eno16777736
192.168.67.0 0.0.0.0 255.255.255.0 U 100 0 0 eno16777736
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| [iyunv@bogon ~]# route add -net 13.0.0.0 netmask 255.0.0.0 gw 192.168.67.4 dev eno16777736
[iyunv@bogon ~]# route
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
default bogon 0.0.0.0 UG 100 0 0 eno16777736
12.0.0.0 bogon 255.0.0.0 UG 0 0 0 eno16777736
13.0.0.0 bogon 255.0.0.0 UG 0 0 0 eno16777736
192.168.67.0 0.0.0.0 255.255.255.0 U 100 0 0 eno16777736
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route del [-net|-host] TARGET gw GATEWAY [dev IFNAME]
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| [iyunv@bogon ~]# route del -net 13.0.0.0 netmask 255.0.0.0 gw 192.168.67.4 dev eno16777736
[iyunv@bogon ~]# route
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
default bogon 0.0.0.0 UG 100 0 0 eno16777736
12.0.0.0 bogon 255.0.0.0 UG 0 0 0 eno16777736
192.168.67.0 0.0.0.0 255.255.255.0 U 100 0 0 eno16777736
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netstat 命令：显示网路连接，路由表，伪装链接，多播成员关系
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| [iyunv@bogon ~]# netstat
Active Internet connections (w/o servers)
Proto Recv-Q Send-Q Local Address Foreign Address State
tcp 0 0 bogon:ssh bogon:63059 ESTABLISHED
tcp 0 52 bogon:ssh bogon:54942 ESTABLISHED
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netstat -r：显示内核路由表
netstat -n: 数字格式，不反解IP地址至主机名；
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| [iyunv@bogon ~]# netstat -n
Active Internet connections (w/o servers)
Proto Recv-Q Send-Q Local Address Foreign Address State
tcp 0 0 192.168.67.128:22 192.168.67.1:63059 ESTABLISHED
tcp 0 52 192.168.67.128:22 192.168.67.1:54942 ESTABLISHED
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netstat -t:TCP协议的相关连接,链接均有其状态
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| [iyunv@bogon ~]# netstat -t
Active Internet connections (w/o servers)
Proto Recv-Q Send-Q Local Address Foreign Address State
tcp 0 0 bogon:ssh bogon:63059 ESTABLISHED
tcp 0 52 bogon:ssh bogon:54942 ESTABLISHED
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netstat -u：udp协议的相关连接
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| [iyunv@bogon ~]# netstat -u
Active Internet connections (w/o servers)
Proto Recv-Q Send-Q Local Address Foreign Address State
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netstat -w：raw socket相关的链接
netstat -l：处于监听的链接
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| [iyunv@bogon yum.repos.d]# netstat -l
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address Foreign Address State
tcp 0 0 0.0.0.0:ssh 0.0.0.0:* LISTEN
tcp 0 0 localhost:ipp 0.0.0.0:* LISTEN
tcp 0 0 localhost:smtp 0.0.0.0:* LISTEN
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Proto 协议
Recv-Q 接受队列
Send-Q 发送队列
netstat -a：所有状态 （运行，监听）
netstat -n：以数字格式显示IP和Port
netstat -e：显示扩展格式
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| [iyunv@bogon ~]# netstat -e
Active Internet connections (w/o servers)
Proto Recv-Q Send-Q Local Address Foreign Address State User Inode
tcp 0 52 bogon:ssh bogon:56488 ESTABLISHED root
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netstat -i 显示所有接口
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| [iyunv@bogon ~]# netstat -i
Kernel Interface table
Iface MTU RX-OK RX-ERR RX-DRP RX-OVR TX-OK TX-ERR TX-DRP TX-OVR Flg
eno16777 1500 300 0 0 0 137 0 0 0 BMRU
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netstat -I<inteferce>
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| [iyunv@bogon ~]# netstat -Ieno33554984
Kernel Interface table
Iface MTU RX-OK RX-ERR RX-DRP RX-OVR TX-OK TX-ERR TX-DRP TX-OVR Flg
eno33554 1500 0 0 0 0 140 0 0 0 BMRU
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ifup /ifdown 打开、关闭网卡
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| [iyunv@bogon network-scripts]# ifup eno33554984
Connection successfully activated (D-Bus active path: /org/freedesktop/NetworkManager/ActiveConnection/21)
[iyunv@bogon network-scripts]# ifdown eno33554984
Device 'eno33554984' successfully disconnected.
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housname
CentOS6:
查看主机名：hostname
配置主机名：hostname HOSTNAME
通过修改配置文件配置文件：/etc/sysconfig/network 中 HOSTNAME=<HOSTNAME>
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| [iyunv@localhost ~]# vim /etc/sysconfig/network
NETWORKING=yes
HOSTNAME=localhost.localdomain
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CentOS7:
hostnamectl status：显示当前主机名设定：
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| [iyunv@bogon ~]# hostnamectl status
Static hostname: localhost.localdomain
Transient hostname: bogon
Icon name: computer-vm
Chassis: vm
Machine ID: 5428a4d5a4bb46b8a5d02ecc7d30d003
Boot ID: c86d23aa109846569cf578d31f2b25e5
Virtualization: vmware
Operating System: CentOS Linux 7 (Core)
CPE OS Name: cpe:/o:centos:centos:7
Kernel: Linux 3.10.0-327.el7.x86_64
Architecture: x86-64
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hostnamectl set-hostname 设定主机名，永久有效；
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| Unknown operation set-lin
[iyunv@bogon ~]# hostnamectl set-hostname lin
[iyunv@bogon ~]# hostnamectl
Static hostname: lin
Icon name: computer-vm
Chassis: vm
Machine ID: 5428a4d5a4bb46b8a5d02ecc7d30d003
Boot ID: c86d23aa109846569cf578d31f2b25e5
Virtualization: vmware
Operating System: CentOS Linux 7 (Core)
CPE OS Name: cpe:/o:centos:centos:7
Kernel: Linux 3.10.0-327.el7.x86_64
Architecture: x86-64
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ip：
ip link 网络设备配置
ip link set interface down
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| [iyunv@bogon ~]# ip link set eno33554984 down
[iyunv@bogon ~]# ifconfig
eno16777736: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 192.168.67.128 netmask 255.255.255.0 broadcast 192.168.67.255
inet6 fe80::20c:29ff:fe74:803f prefixlen 64 scopeid 0x20<link>
ether 00:0c:29:74:80:3f txqueuelen 1000 (Ethernet)
RX packets 15526 bytes 1106373 (1.0 MiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 5354 bytes 933749 (911.8 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536
inet 127.0.0.1 netmask 255.0.0.0
inet6 ::1 prefixlen 128 scopeid 0x10<host>
loop txqueuelen 0 (Local Loopback)
RX packets 12 bytes 1020 (1020.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 12 bytes 1020 (1020.0 B)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
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ip link set interface up
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| [iyunv@bogon ~]# ifconfig
eno16777736: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 192.168.67.128 netmask 255.255.255.0 broadcast 192.168.67.255
inet6 fe80::20c:29ff:fe74:803f prefixlen 64 scopeid 0x20<link>
ether 00:0c:29:74:80:3f txqueuelen 1000 (Ethernet)
RX packets 15568 bytes 1109751 (1.0 MiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 5378 bytes 937177 (915.2 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
eno33554984: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
ether 00:0c:29:74:80:49 txqueuelen 1000 (Ethernet)
RX packets 0 bytes 0 (0.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 254 bytes 43248 (42.2 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
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ip link set interface multicast on 开启组播
ip link set interface multicastoff 关闭组播
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| [iyunv@bogon network-scripts]# ip link set eno33554984 multicast off
[iyunv@bogon network-scripts]# ifconfig eno33554984
eno33554984: flags=67<UP,BROADCAST,RUNNING> mtu 1500
ether 00:0c:29:74:80:49 txqueuelen 1000 (Ethernet)
RX packets 0 bytes 0 (0.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 254 bytes 43248 (42.2 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
[iyunv@bogon network-scripts]# ip link set eno33554984 multicast on
[iyunv@bogon network-scripts]# ifconfig eno33554984
eno33554984: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
ether 00:0c:29:74:80:49 txqueuelen 1000 (Ethernet)
RX packets 0 bytes 0 (0.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 254 bytes 43248 (42.2 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
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ip link set interface name NAME 更改设备名称
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| [iyunv@bogon network-scripts]# ip link set eno33554984 name eth0
[iyunv@bogon network-scripts]# ifconfig eth0
eth0: flags=4098<BROADCAST,MULTICAST> mtu 1500
ether 00:0c:29:74:80:49 txqueuelen 1000 (Ethernet)
RX packets 0 bytes 0 (0.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 254 bytes 43248 (42.2 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
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ip link set interface mtu 设置MTU值，默认1500
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| root@bogon network-scripts]# ip link set eth0 mtu 1600
[iyunv@bogon network-scripts]# ifconfig eth0
eth0: flags=4098<BROADCAST,MULTICAST> mtu 1600
ether 00:0c:29:74:80:49 txqueuelen 1000 (Ethernet)
RX packets 0 bytes 0 (0.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 254 bytes 43248 (42.2 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
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ip netns :创建指定的空间
ip netns list 累出所有的netns
ip netns add name 增加指定的netns
ip netns del name 删除指定的netns
ip netns exec NAME COMMAND指定的netns中运行命令
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| [iyunv@bogon network-scripts]# ip netns list
[iyunv@bogon network-scripts]# ip netns add test
[iyunv@bogon network-scripts]# ip netns list
test
[iyunv@bogon network-scripts]# ip link set eth0 netns test
[iyunv@bogon network-scripts]# ifconfig
eno16777736: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 192.168.67.128 netmask 255.255.255.0 broadcast 192.168.67.255
inet6 fe80::20c:29ff:fe74:803f prefixlen 64 scopeid 0x20<link>
ether 00:0c:29:74:80:3f txqueuelen 1000 (Ethernet)
RX packets 18036 bytes 1295528 (1.2 MiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 6286 bytes 1033927 (1009.6 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536
inet 127.0.0.1 netmask 255.0.0.0
inet6 ::1 prefixlen 128 scopeid 0x10<host>
loop txqueuelen 0 (Local Loopback)
RX packets 12 bytes 1020 (1020.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 12 bytes 1020 (1020.0 B)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
[iyunv@bogon network-scripts]# ip netns del test
[iyunv@bogon network-scripts]# ifconfig
eno16777736: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 192.168.67.128 netmask 255.255.255.0 broadcast 192.168.67.255
inet6 fe80::20c:29ff:fe74:803f prefixlen 64 scopeid 0x20<link>
ether 00:0c:29:74:80:3f txqueuelen 1000 (Ethernet)
RX packets 18104 bytes 1301156 (1.2 MiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 6323 bytes 1038797 (1014.4 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
eno33554984: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1600
inet 192.168.66.123 netmask 255.255.255.0 broadcast 192.168.66.255
inet6 fe80::20c:29ff:fe74:8049 prefixlen 64 scopeid 0x20<link>
ether 00:0c:29:74:80:49 txqueuelen 1000 (Ethernet)
RX packets 0 bytes 0 (0.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 262 bytes 43868 (42.8 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
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ip addr:用来实现管理IP地址
ip addr add IP/MASK dev label
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| [iyunv@lin ~]# ip addr add dev eth0 192.168.77.78/24 label eth0:1
[iyunv@lin ~]# ip addr add dev eth0 192.168.77.79/24 label eth0:2
[iyunv@lin ~]# ifconfig
eno16777736: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 192.168.67.128 netmask 255.255.255.0 broadcast 192.168.67.255
inet6 fe80::20c:29ff:fe74:803f prefixlen 64 scopeid 0x20<link>
ether 00:0c:29:74:80:3f txqueuelen 1000 (Ethernet)
RX packets 19978 bytes 1455021 (1.3 MiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 7267 bytes 1146820 (1.0 MiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1600
inet 192.168.77.74 netmask 255.255.255.0 broadcast 0.0.0.0
ether 00:0c:29:74:80:49 txqueuelen 1000 (Ethernet)
RX packets 0 bytes 0 (0.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 266 bytes 44112 (43.0 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
eth0:1: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1600
inet 192.168.77.78 netmask 255.255.255.0 broadcast 0.0.0.0
ether 00:0c:29:74:80:49 txqueuelen 1000 (Ethernet)
eth0:2: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1600
inet 192.168.77.79 netmask 255.255.255.0 broadcast 0.0.0.0
ether 00:0c:29:74:80:49 txqueuelen 1000 (Ethernet)
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ip addr delete 删
ip addr show 显示所有路由信息
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| [iyunv@lin ~]# ip addr delete dev eth0 192.168.77.77/24
[iyunv@lin ~]# ifconfig eth0
eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1600
inet 192.168.77.74 netmask 255.255.255.0 broadcast 0.0.0.0
ether 00:0c:29:74:80:49 txqueuelen 1000 (Ethernet)
RX packets 0 bytes 0 (0.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 266 bytes 44112 (43.0 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
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ip addr flush 清空所有
ip route
ip route option TPYE PREFIX via[GW] [dev IFACE] [src SOUCE]
ip route add 添加路由
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| [iyunv@lin ~]# ip route add 10.0.0.0/8 via 192.168.67.1
[iyunv@lin ~]# ip route show
default via 192.168.67.2 dev eno16777736 proto static metric 100
10.0.0.0/8 via 192.168.67.1 dev eno16777736
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ip route delete：删除路由
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| [iyunv@lin ~]# ip route del 10.0.0.0/8 via 192.168.67.1
[iyunv@lin ~]# ip route show
default via 192.168.67.2 dev eno16777736 proto static metric 100
192.168.67.0/24 dev eno16777736 proto kernel scope link src 192.168.67.128 metric 100
192.168.77.0/24 dev eth0 proto kernel scope link src 192.168.77.74
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ip route get:获得路由嘻嘻
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| [iyunv@lin ~]# ip route get 192.168.67.0
broadcast 192.168.67.0 dev eno16777736 src 192.168.67.128
cache <local,brd>
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ip route flush
ss
ss [options] [FILTER]
-t:TCP协议的相关连接
-u: UDP相关连接
-w： raw socket相关的链接
-l:监听状态的了解
-n：数字格式
-p:相关的程序及其PID
-e:扩展格式信息
-m：内存用量
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| [iyunv@lin ~]# ss -tnl
State Recv-Q Send-Q Local Address:Port Peer Address:Port
LISTEN 0 128 *:22 *:*
LISTEN 0 128 127.0.0.1:631 *:*
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-o:及其他信息
dport=目标端口
sport=源端口
示例：'（ dport=:22 sport=：22 ） '
ss -tan '( dport=:22 or sport=:22 )'
ss -tan state ESTABLISHED
通过修改配置文件来配置网络属性：
IP/NETMASK/GW/DNS:
/etc/sysconfig/network-scripts/ifcfg-IFACE
IFACE:接口名称；
路由的相关配置文件：
/etc/sysconfig/network-scripts/route-IFACE
支持两种配置方式，但不可混用
（1）每行一个路由条目
TARGET via GW
(2)没三行一个路由条目
ADDRESS#=TARGER
NETWORK#=MASK
GATEWAY#=NEXT
配置DNS服务器指向：
配置文件： /etc/resolv.conf 最多有三个主机
nameserver DNS_SERVER_IP
如何测试：（host/nslookup/dig）
/etc/hosts
系统中ping命令是事显查看/etc/hosts文件中是否有IP和域名对应的，没有的话在查看resolv.conf,
因此测试的时候要跳开host文件
dig -t A 主机名 FQDN（www.baidu.com）
FQDN--> IP
dig -x IP
IP--> 主机名
nmcli
device:显示并且网络接口
nmcli device status
nmcli device connect
nmcli device disconnect
nmcli device show
connection:
nmcli connection show
nmcli connection up IFACE
nmcli connectionn down IFACE
nmcli connectionn modify IFACE [+|-]setting address vlue
setting:
ipv4.addresss
ipv4.gateway
ipv4.dns1
ipv4.method 配置方法
manual static?
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发表于 2016-3-25 09:03:28
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